NEW YORK — A woman who appeared to win a life-changing $42.9 million jackpot at a New York City casino is threatening to sue after being told the big payout she was shown was simply the result of a malfunction.

Katrina Bookman was playing the penny slot machine at Resorts World Casino in August when it displayed a message that read, ‘‘Printing Cash Ticket. $42,949,642.76.’’ She even took a selfie next to the screen to celebrate. But when Bookman tried to collect, the casino told her it was all a big mistake and she was only owed the $2.25 balance she had on the machine.

‘‘Machine malfunctions are rare, and we would like to extend our apologies to Ms. Bookman for any inconvenience this may have caused,’’ the casino said in a statement.

The New York State Gaming Commission investigated and said the bogus payout was ‘‘clearly a display malfunction.’’ The machine was taken out of service, repaired ,and put back a day later, the commission said.

The machine’s maximum payout is $6,500.

Associated Press